402402131 has 4 divisors (see below), whose sum is σ = 402645192. Its totient is φ = 402159072.

The previous prime is 402402107. The next prime is 402402139. The reversal of 402402131 is 131204204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402402131 - 2¹⁰ = 402401107 is a prime.

It is a super-2 number, since 2×402402131² = 323854950066682322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402402139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119030 + ... + 122363.

It is an arithmetic number, because the mean of its divisors is an integer number (100661298).

Almost surely, 2^402402131 is an apocalyptic number.

402402131 is a deficient number, since it is larger than the sum of its proper divisors (243061).

402402131 is a wasteful number, since it uses less digits than its factorization.

402402131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243060.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402402131 is about 20059.9633848120. The cubic root of 402402131 is about 738.2782781224.

Adding to 402402131 its reverse (131204204), we get a palindrome (533606335).

The spelling of 402402131 in words is "four hundred two million, four hundred two thousand, one hundred thirty-one".